A 256-TES Array for the Detection of CMB B-Mode Polarisation

Abstract : As part of the Q&U Bolometric Interferometer for Cosmology instrument targeting the cosmic microwave background primordial B-modes, two kilo-pixel focal planes have been designed for a NEP of W adapted for ground-based observations. Those pixels are transition edge sensors (TESs) made of voltage-biased NbSi thin films with a critical temperature 400 mK and TiV absorbing grids. The TESs are coupled to a time-domain multiplexed electronics based on superconducting quantum interference devices and an additional SiGe cryogenic integrated circuit which provides a second multiplexing stage. In this paper, we briefly discuss the instrumental context of a quarter of focal plane (a 256-TES sub-array). Then, we present its typical manufacturing process and first test results at cryogenic temperature.
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http://hal.in2p3.fr/in2p3-01389594
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Submitted on : Friday, October 28, 2016 - 4:50:01 PM
Last modification on : Tuesday, July 16, 2019 - 9:02:07 AM

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C. Perbost, S. Marnieros, B. Belier, M. Piat, D. Prele, et al.. A 256-TES Array for the Detection of CMB B-Mode Polarisation. Journal of Low Temperature Physics, Springer Verlag (Germany), 2016, 184 (3-4), pp.793-798. ⟨10.1007/s10909-016-1586-9⟩. ⟨in2p3-01389594⟩

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